diff options
| author | Kenneth Waters <kwaters@chromium.org> | 2011-04-25 12:29:54 -0600 |
|---|---|---|
| committer | Ben Dooks <ben-linux@fluff.org> | 2011-05-11 06:45:08 +0100 |
| commit | 65a1a0ace554d61ea5a90377a54df1505275c1b1 (patch) | |
| tree | b66c335b017a0be40ed73a6adf1ea2711f613d6c /drivers/i2c | |
| parent | 9f381a61f58bb6487c93ce2233bb9992f8ea9211 (diff) | |
| download | linux-65a1a0ace554d61ea5a90377a54df1505275c1b1.tar.bz2 | |
i2c: tegra: Enable new slave mode.
For Tegra i2c controller to function properly new slave mode must be
enabled.
swarren notes:
In particular, I found this was needed when working on enabling the
Tegra audio driver on the Seaboard board. There are two different PCB
layouts for this board; a "clamshell" version, which works just fine
without this change, and the original non-clamshell version, which needs
this change in order for I2C to operate correctly. Without it, I2C
probing fails for some devices, e.g. with:
wm8903 0-001a: Device with ID register 0 is not a WM8903
wm8903 0-001a: asoc: failed to probe CODEC wm8903.0-001a: -19
asoc: failed to instantiate card tegra-wm8903: -19
ALSA device list:
No soundcards found.
Signed-off-by: Rakesh Iyer <riyer@nvidia.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index b4ab39b741eb..5f1b92c74bd9 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -330,6 +330,11 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) i2c_writel(i2c_dev, 0, I2C_INT_MASK); clk_set_rate(i2c_dev->clk, i2c_dev->bus_clk_rate * 8); + if (!i2c_dev->is_dvc) { + u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG); + i2c_writel(i2c_dev, sl_cfg | I2C_SL_CNFG_NEWSL, I2C_SL_CNFG); + } + val = 7 << I2C_FIFO_CONTROL_TX_TRIG_SHIFT | 0 << I2C_FIFO_CONTROL_RX_TRIG_SHIFT; i2c_writel(i2c_dev, val, I2C_FIFO_CONTROL); |